Shinkai no Kantai - Submarine 707 plot
In the deepest seas, submarine 707 investigates an area where many ships have been shipwrecked. Once the crew members find an artificial hole in the seabed, they are attacked by a mysterious submarine. They survive the attack, but the submarine is battered. To make the necessary repairs, submarine 707 must land on the seabed. Suddenly the seabed disappears and the submarine ends up in an unknown new world called Moo. The crew members discover that Moo is inhabited and under constant threat from one Red . This Red is developing a base to illegally extract magma from the seabed. The 1,500-year-old legend of Moo anticipates a crisis that could destroy not just Moo, but the entire planet. Is there anything else anyone can do to prevent that?